A product with this feature indicates that the item is XM SATELLiTE RADiO (XM Ready), allowing you to hear over 150 digital channels of music, news, sports, talk and entertainment from America's number one Satellite Radio service. With the addition of the optional digital antenna XM Mini-Tuner Home Dock and the XM Mini-Tuner accessories sold separately, just subscribe to XM SATELLiTE RADiO and hear radio as it was meant to be!